1. Department of Otorhinolaryngology and Laryngological Oncology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia in Katowice, Poland
2. Department of Biochemistry, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, Poland
3. Department of Neurology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia in Katowice, Poland